iOS解析整個XML元素

Question

我知道有關XML的問題在這裏已經回答了數百萬次，但是我找不到適合我的任何答案。這是我的問題，歡迎任何幫助！

閱讀我的服務器從一個PHP腳本一個XML文件，並將其發送到NSXMLParser後，我無法找到一個辦法讓在XML稱爲「名稱」的所有元素，才能在我的應用程序後以填充UITableView。我的目標是讀取整個XML文件，獲取名爲「name」的所有元素並將它們存儲在NSMutableArray中以填充表視圖。

因此，這裏是通過調用一個PHP腳本傳遞到NSXMLParser XML代碼：

<?xml version="1.0" encoding="ISO-8859-1"?><?xml-stylesheet type="text/xsl" href="auctions_xsl.xsl"?><auctions> 
<auction> 
    <id>1</id> 
    <name>Leilão Tijuca</name> 
    <description>Casa de vila, ótimo estado e ótima localização. Leiloeiro responsável: Fulano de Tal. Contato pelo telefone 3554-5555</description> 
    <date>2012-03-06</date> 
    <imagepath1>imagem 1</imagepath1> 
    <imagepath2>imagem 2</imagepath2> 
    <imagepath3>imagem 3</imagepath3> 
    <location>Rua São Francisco Xavier, 390 - Tijuca - Rio de Janeiro - RJ</title> 
</auction> 
<auction> 
    <id>2</id> 
    <name>Leilão Barra</name> 
    <description>Cobertura ótimo estado. Leiloeiro responsável Leandro. Contato pelo tel: 3554-9356</description> 
    <date>2012-03-28</date> 
    <imagepath1>001</imagepath1> 
    <imagepath2>002</imagepath2> 
    <imagepath3>003</imagepath3> 
    <location>Avenida das Américas, 500 - Barra - Rio de Janeiro - RJ</title> 
</auction> 
<auction> 
    <id>3</id> 
    <name>Leilão Flamengo</name> 
    <description>Apartamento andar baixo. Localizado em frente ao metrô. Leiloeiro Marcel pelo tel 3554-6678</description> 
    <date>2012-03-18</date> 
    <imagepath1>im1</imagepath1> 
    <imagepath2>im2</imagepath2> 
    <imagepath3>im3</imagepath3> 
    <location>Avenida Oswaldo Cruz, 110 - Flamengo - Rio de Janeiro - RJ</title> 
</auction> 

這裏是我的Objective-C代碼部分：（錯件評論）

-(void)viewDidLoad { 

[super viewDidLoad]; 
NSURL *url = [NSURL URLWithString:@"http://leandroprellapps.capnix.com/script.php"]; 
NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithContentsOfURL:url]; 
allNames = [NSMutableArray arrayWithObjects: nil]; //declared as instance variable in .h file 
xmlParser.delegate = self; 
[xmlParser parse]; 
NSLog(@"%@",allNames); //getting wrong data here 
} 

//and later on 

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict { 

// SUPPOSE TO READ ALL XML FILE AND FIND ALL "name" ELEMENTS 
if ([elementName isEqualToString:@"name"]) { 

    self.currentName = [[NSMutableString alloc] init];  
    } 
} 

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { 

[self.currentName appendString:string]; //passing the value of the current elemtn to the string 
} 

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName { 

if ([elementName isEqualToString:@"name"]) { 

    NSLog(@"%@", currentName); //show current element 
    [allNames addObject:currentName];//not only is not reading all xml "name" elements but also adding another elements not shown in above NSLog....   
    } 
} 

爲了舉例說明，這裏是我的NSLog結果：

2012-03-06 22:51:37.622 Leilao Invest 2.0[10032:f803] Leilão Tijuca 

2012-03-06 22:51:37.623 Leilao Invest 2.0[10032:f803] (
"Leil\U00e3o Tijuca\n\t\tCasa de vila, \U00f3timo estado e \U00f3tima localiza\U00e7\U00e3o. Leiloeiro respons\U00e1vel: Fulano de Tal. Contato pelo telefone 3554-5555\n\t\t2012-03-06\n\t\timagem 1\n\t\timagem 2\n\t\timagem 3\n\t\tRua S\U00e3o Francisco Xavier, 390 - Tijuca - Rio de Janeiro - RJ" 

）

注意，第一NSLog顯示當前元素的正確名稱，但在第二NSLog，將當前元素後做我的MutableArray，它只顯示所謂的「名」的第一個元素和一堆其他元素不應該被添加，並且它不保留字符串的編碼（NSISOLating1）。

Answer 1

這是因爲當解析器發現任何標籤之間的東西時，foundCharacters函數會被調用。

在你的情況下，你的第一個標記是'id'，因爲它不匹配名字，你的currentName沒有初始化，因此當字符串currentName爲零時，字符不會附加值'2'。然後第二個標籤是名稱，所以它符合您的條件並初始化字符串。從這一點，標籤之間找到的每個字符都會附加到currentName。

如果您只想解析名稱，一種方法是在將字符附加到currentName之前檢查當前標記是否爲'name'。

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict { 

    // SUPPOSE TO READ ALL XML FILE AND FIND ALL "name" ELEMENTS 
    if ([elementName isEqualToString:@"name"]) { 
     isNameTag = YES; 
     self.currentName = [[NSMutableString alloc] init];  
    } 
} 

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { 
    if (isNameTag) { 
     [self.currentName appendString:string]; //passing the value of the current elemtn to the string 
    } 
} 

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName { 

    if ([elementName isEqualToString:@"name"]) { 
     isNameTag = NO; // disable the flag 
     NSLog(@"%@", currentName); //show current element 
     [allNames addObject:currentName];//not only is not reading all xml "name" elements but also adding another elements not shown in above NSLog....   
    } 
}